campbell



(No Model.) 2'Sheets-.Sheet 1.

- A. CAMPBELL. MECHANISM EORRAISING THE ROLLERS 0F PRINTING rgsssas.

No. 297,752. PatentedAPr. 29, 1884.

-'.INVENTOR:

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(No Model.)

I A. CAMPBELL. MECHANISM FOR RAISING THE ROLLERS OP PRINTING PRESSES.No. 297,752.

INVENTOR:

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WITNESSES:

ilNrTED STATES PATENT Orn ment ANDREYV CAMPBELL, OF BROOKLYN, ASSIGNORTO JOHN AND EDMUND MOLOUGHLIN,v BOTH OF NEW YORK, N. Y. I

MECHANISM FOR RAISING THE ROLLERS OF PRINTING-'PRESSES.

SPECIFICATION fdl'mii'ig part Of Letters Patent NO. 297,752, dated April29, 1884.

' Application filed September 11, 1883. (No model.) v

To rtZZ whom it worry-concern:

Be it known that I, ANDREW CAMPBELL, a citizen of the United States, anda resident of Brooklyn, Kings county, New York, have invented certainImprovements in Mechanism for Raising the Rollers of Printing-Presses,of which the following is a specification.

My invention relates to mechanism for simultaneously raising andseparating the form and distributing rollers of a printing-press,whereby they are relieved from pressure on each other and on the stoneor form.

The main purpose of the invention isto provide a convenient means forthus relieving the rollers while the press is at rest,'in order thatthey may rest wholly on their bearings with their surfaces out ofcontact with everything."-

ers, which have a slight play endwise, and a set of distributing-rollersarranged overthese, which have the usual reciprocating end-play. Eachset of rollers is mounted in a frame arranged to play vertically; butthe frames move independently. Cam shafts are. provided, which, by apartial rotation, raise both sets of rollers slightly, the lower or formrollers high enough to clear the form, and the upper or distributingrollers'high enough to clear the formrollers when the latter are raised.The movement need not be sufficient to disengage the cog driving-gears,and the rollers may be lifted when the press is in operation.

In the drawings which serve to illustrate my invention, Figure l isaside elevation of a part of a printing-press provided with myimprovements; and Fig. 2 is a vertical section taken, substantially, online 2 2 in Fig. 1.- Figs. 3 and 4 are cross-sections of the camshaft onalarger scale,showing the cams formed thereon. These are taken,respectively, on lines 3 3 and 4 4 in 'Fig. 2.

Let A represent the side frames of a printing-press; B, theprinting-cylinder; O, the reciprocating bed; D, the lithographic stoneor type-form, as the case may be; E E, the'forrnrollers, and F F thedistributing-rollers. On the press-frame is formed or mounted a long toshaft 12 first in one direction and then in the other. On the outer endofshaft b is secured a broad-faced gear-wheel,e,which meshes with anintermediate nut-gear, f, which turns on a screw-threaded stud, g. Theboss of the gearwheel f is internally screw-threaded, and the rotationof the gear-wheel f first in one direction and then in the othercausesthe said gearwheel to move axially along the stud, in and out. On theprolonged spindle h of the central distributing-roller, F, is fixed aflanged gear-wheel, i, Which meshes with the intermediate nut-gear, f,and the said roller F is thus given asim ultaneous rotary and endwisemovement, as will be understood,whi.ch movements are simultaneouslyreversed, its endwise move ment being due to the embracing of the wheelf between the flanges on the wheel i. In order to drive the otherdistributing-rollers, F, from the intermediate roller, E, and to givethem the same longitudinal movement, I mount on the spindles of thedistributingrollers flanged gear-wheels j j, and on rods 7c k,whichextend mesh with the wheels j j. These pinions Z are free to slide onthe rods 70, and are caused to move axially with the wheelsj, and so toremain in mesh therewith byv their confinement between the flangesthereon. c Having thus briefly described the arrangement of the.rollers. I will now describe the means for raising them, beginning withthe distributing-rollers. These have bearings at both ends in bars in m,mounted on posts a n two at each side of the presswhich are connected atthe bottom by bars 0 0. As the frames which bear the rollers are alikeat each side of-the press, it will only be necessary to describe oneminutely. The posts a project up through the bar m, and a platform, 1),is, .by preference, mounted on their upward prolongations. They havebearings at q in a flange on the frame A, through which they slide whenthe rollers are lifted. The bar 0 has slotted bearings on studs 1" inthe main frame.

G Gare cam-shafts, which have bearings at I at both sides of the pressare alike.

8 s in the main frame, and are capable of being rocked in said bearingsby means of a suitable lever, t. In order that both cam-shafts may berocked simultaneously by one lever, the shafts are provided at one endwith cranks or arms 'u,which are connected by a bar, a. Any kind of camsmay be employed; but for simplicity I prefer to flatten aspace on thecylindrical cam-shaft, as shown at w in Fig. 3, and arrange the bar 0 torest on or over this flattened space when the distributing-rollers areat their lowest point. Vhen the cam-shafts are slightly rotated orrocked, the higher surface of the cam-shaft is brought under the bar 0,and the distributing-rollers are lifted.

The form-rollers E E (six being shown in Fi 1) are mounted in framesarranged at each side of the press, the sameas the distributingrollers.

I I are the adjustable bracket-bearings for the rollers, which aresecured to opposite plates, J J, arranged against the inner sides of thepress-frames and guided on studs 0* and r. The lower edges of theseplates J J rest on cams 10, formed 011 the cam-shafts G precisely likethe cams 'w for the frame which bears the distributingroller, exceptthat the throw or lift of the cams zris less by about one-half than thatof the cams a. The stud gis borneby the frame J, in order that thegear-wheel f shall be lifted half the distance of the gear 2', and sokeep the gears f and 2' alwaysinmesh without necessitating theemployment of unusually long cog-teeth.

As I have before stated, the lifting devices I prefer, however, toarrange the lever t 011 one side of the press and the arms a and bareonthe other side, as shown in Fig. 2. This construction lifts the rollerssimultaneously at both ends, and very evenly, as there are four cams 10and four cams w.

H is a shield to house the gearing, which is secured to the bar m, asindicated in Fig. 1, where a part of the shield is broken away to showthe gearing. As this shield moves up and down with thedistributing-rollers, it is guided at the bottom by a pin, 00, set inthe bearing a, or some other fixed part. The shield slides on this pin.

The drawings show the rollers lowered in their normal working position.

I am aware that it is not new to mount distributing-rollers in a frameand provide said frame with a lever whereby the said rollers may belifted up clear of the form-rollers, and I am also aware that cams havebeen arranged to lift distributing-rollers off a revolving cylinder atproper intervals. These features I do not claim. My mechanism isdesigned to lift both sets of rollers simultaneously and to separatethem at the same time. This requires that each set of rollers shall bemounted independently of the other.

Having thus described my invention, I claim- 1. In a printing-press, thecombination, with the set of form-rollers and the set ofdistributing-rollers, each set mounted in movable bearings capable ofbeing moved independently of the bearings of the other set, of the saidbearings and means, substantially as described, for simultaneouslylifting said movable hearings to different heights, whereby theform-rollers are lifted from the form and the distributingrollers fromthe form-rollers, for the purposes specified.

2. In a printing-press, the combination of the fOlll'l-lOllClS, a framecapable of vertical motion and affording bearings in which said rollersare mounted rotatively, the distributing-rollers, another frame bearingsaid distributing-rollers and also capable of vertical motion, andmeans, substantially as set forth, for lifting both said frames, andthereby lifting the form-rollers out of contact with the form and thedistributing-rollers out of contact with the form-rollers, substantiallyas set forth.

3. The combination of the form and distributing rollers, mountedsubstantially as shown, the sliding frames in which said rollers aremounted, constructed and arranged substantially as shown, the cam-shaftsG G, provided with cams w w and w w, and arms a a, and bar a,substantially as and for the purposes set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

ANDREYV CAMPBELL.

Witnesses:

ARTHUR C. FRASER, Gno. BAINTON.

